Specific dropped connections
Near as I can tell, the problem lies in my connection (on these computers only) getting dropped. Streaming or torrent downloads aren't affected, because they pick it back up, but others are. And even those can slow down as a result of this. The source of the problem couldn't be removed by the malware/spyblockers given above, so my best guess is that something on the computers is interrupting my internet connection sporadically. Any way to find out what it is?